Literatura académica sobre el tema "Transitoire accidentel"
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Artículos de revistas sobre el tema "Transitoire accidentel"
Deltour, S. "Accident ischémique transitoire". EMC - Traité de médecine AKOS 6, n.º 4 (enero de 2011): 1–8. http://dx.doi.org/10.1016/s1634-6939(11)52296-3.
Texto completoLavallée, Philippa y Pierre Amarenco. "Accident ischémique transitoire". La Presse Médicale 36, n.º 1 (enero de 2007): 134–41. http://dx.doi.org/10.1016/j.lpm.2006.10.021.
Texto completoDurán Ferreras, E., J. Viguera Romero y C. Martínez Parra. "Accidente isquémico transitorio". Revista Clínica Española 207, n.º 10 (noviembre de 2007): 505–7. http://dx.doi.org/10.1157/13111549.
Texto completoRicart Colomé, C., C. Leno Camarero, M. A. Martínez y M. Rebollo Álvarez-Amandi. "Accidente isquémico transitorio". Medicine - Programa de Formación Médica Continuada Acreditado 8, n.º 91 (enero de 2003): 4918–24. http://dx.doi.org/10.1016/s0304-5412(03)70912-3.
Texto completoDeltour, S. "Accidente ischemico transitorio". EMC - AKOS - Trattato di Medicina 14, n.º 1 (enero de 2012): 1–7. http://dx.doi.org/10.1016/s1634-7358(12)60943-7.
Texto completoDeltour, S. "Accidente isquémico transitorio". EMC - Tratado de Medicina 16, n.º 1 (abril de 2012): 1–8. http://dx.doi.org/10.1016/s1636-5410(12)61140-4.
Texto completoPinel, J. F. "Accident ischémique transitoire en 2009". Journal des Maladies Vasculaires 34, n.º 2 (marzo de 2009): 119. http://dx.doi.org/10.1016/j.jmv.2008.12.129.
Texto completoLpez Muoz, M. M. y A. Serrano Cabrera. "Accidente isqu?mico transitorio". Medicine - Programa de Formaci?n M?dica Continuada Acreditado 9, n.º 72 (febrero de 2007): 4596–602. http://dx.doi.org/10.1016/s0211-3449(07)75418-8.
Texto completoLavallée, P. y P. Amarenco. "Accident ischémique cérébral et rétinien transitoire". EMC - Neurologie 2, n.º 1 (enero de 2005): 1–11. http://dx.doi.org/10.1016/s0246-0378(05)27711-4.
Texto completoLavallée, P. y P. Amarenco. "Accident ischémique cérébral et rétinien transitoire". EMC - Neurologie 2, n.º 1 (febrero de 2005): 1–16. http://dx.doi.org/10.1016/j.emcn.2004.10.006.
Texto completoTesis sobre el tema "Transitoire accidentel"
Matteo, Laura. "Modélisation unidimensionnelle du comportement d’une pompe rotodynamique en fonctionnement normal et accidentel". Thesis, Paris, ENSAM, 2019. http://www.theses.fr/2019ENAM0038/document.
Texto completoConversion of mechanical energy into pressure inside a fluid -or inversely-, is necessary in numerous industries: transport, electricity production, air circulation... Rotating machineries are often used in these frames. They are constituted of at least one bladed rotating part giving energy to the fluid (the impeller) and connected to a shaft, which is entrained by a motor in the case of a pump. The design method of such turbomachines has evolved from the begining of the last century to these days. Nowadays Computational Flow Dynamics (CFD) local scale computations are used to optimize the pump components. Local simulation allows to obtain information on what is happening inside the machine in three dimensions. However, qualification of the local results of such simulations remains a challenge, mostly due to constraints on experimental technics. Additionally, computation cost of such local simulations is heavy even at the scale of the machine alone. That hardly allows the simulation of transient scenarii on whole and complex systems such as a reactor, which are studied in the frame of nuclear safety in particular. And even more when uncertainty propagation studies are intended, which involve a large number of simulations. In such a context, a model of an intermediate scale -between the global study of the machine using velocity triangles and local CFD computations- has been developed during this PhD thesis. The proposed approach consists in considering a mean stream line that is adopted by the flow inside each part of the machine, associated to a one-dimensional (1D) meshing. By defining main geometrical characteristics of the machine, it can predict its performances in terms of pressure rise and energy given to the fluid. Several turbomachines have been modelled using this 1D model: centrifugal pumps, mixed flow pumps and a radial compressor. Various working fluids have been simulated, such as water, liquid metal sodium and air non-condensable gas. Single-phase and two-phase flow regimes have been represented in those machines in steady and transient conditions. The model is able to predict performances of machines of various geometries in steady single-phase conditions with a relative error globally less than 15% for a large range of flow rates. The model allows also to detect the occurrence of cavitation for a centrifugal pump in various conditions of flow rate. It catches also pump fast startup transient dynamics in single-phase conditions. It subsists numerical difficulties when simulating the same transient in cavitating conditions. A pump modelled as described here can be included into the modelling of closed experimental loops or complex facilities such as nuclear reactors. This work opens up new possibilities to study accidental transient in the frame of safety analysis. Intented application prospects of the model are the modelling of turbines or multi-stage machines and the use of other fluids
Martin, François. "Modélisation avancée neutronique-thermohydraulique pour les MSR (Réacteurs à Sels Fondus) de type RNR à combustible liquide". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALI004.
Texto completoA molten salt reactor (MSR) is a GEN-IV nuclear reactor type where a liquid, high-temperature salt acts as both the fuel and the primary coolant. This characteristic has two main impacts : a strong density feedback and the delayed neutron precursors transport with the fuel salt.These two aspects require adapting the calculation codes used for nuclear reactor studies. In CEA, a coupled code was developed for MSRs studies, combining the deterministic neutronics code APOLLO3® and the CFD code TrioCFD. The objective of the PhD is to study the turbulent fluctuations in MSRs, using the coupled tool APOLLO3®-TrioCFD.In a first step, a validation step of the coupled tool was performed on the first MSR ever built, the Aircraft Reactor Experiment (ARE). Numerous experiments have been performed and documented on the ARE, which enabled comparisons between the experimental results and the simulations performed on a numerical model of the ARE.In a second step, the coupled tool was used to model the Molten Salt Fast Reactor (MSFR) concept, developed for twenty years in CNRS first, then within a European consortium. The MSFR possesses a toroidal core shape where a highly turbulent fuel salt flows. The first calculations performed on the MSFR were purely CFD (RANS and LES turbulence models), in order to resolve accurately the thermal-hydraulics model of the steady-state flow of the reactor. These first calculations also lead to early estimates of the power fluctuations in the core.Eventually the coupled neutronics – thermal-hydraulics system was studied, in order to analyse the respective impacts of each physics. Precise estimates of the temperature and power fluctuations in the MSFR core were obtained
Droin, Jean-Baptiste. "Modélisation d’un transitoire de perte de débit primaire non protégé dans un RNR-Na". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI044/document.
Texto completoWithin the framework of the Generation IV Sodium-cooled Fast Reactor (SFR) R&D program of CEA (French Commissariat à l’Energie Atomique et aux Energies Alternatives), safety in case of severe accidents is assessed.Such transients are usually simulated with mechanistic codes (such as SAS-SFR and SIMMER III). As a complement to these codes, which give reference accidental transient calculations, a new physico-statistical approach is currently followed by the CEA; its final objective being to derive the variability of the main results of interest for safety. This approach involves a fast-running description of extended accident sequences coupling physical models for the main phenomena to advanced statistical analysis techniques. It enables to perform a large number of simulations in a reasonable computational time and to describe all the possible bifurcations of the accident transient.In this context, this PhD work presents the physical tool (models and results assessment) dedicated to the initiation and primary phases of an Unprotected Loss Of Flow accident (i.e. until the end of sub-assemblies degradation and before large molten pools formation). The accident phenomenology during these phases is described and illustrated by numerous experimental evidences.It is underlined that the features of the new heterogeneous core concept (called CFV of the French ASTRID prototype) leads to different kinds of ULOF transients than those occurring in the previous past homogeneous cores (SuperPhenix, Phenix...). Indeed, its negative void effect drops the nuclear power when sodium heats-up and possibly boils. This enables three types of ULOF transients characterized by various core final states; the first two types leading to final coolable core states in natural circulation flow (the first one in single phase, the second one in stabilized two-phase flow) whereas the core undergoes a flow excursion followed by sub-assemblies degradation in the last type. In this study, a particular attention is paid to stabilize boiling occurrence which leads to minimize severe accident consequences.The phenomena occurring during the various ULOF transients are modelled in accordance to the level of details required to catch all the possible bifurcations of the transient. The tool coupled different (2D, 1D and 0D) models of thermics, thermo-hydraulics, core degradation (material melting and motions) and neutronics. The assumptions associated to these models are highlighted, discussed and validated. The physical tool capability of simulating the various realistic ULOF transients (without boiling, with stabilized boiling or flow excursion after boiling) is demonstrated by comparisons to experimental results (GR19, SCARABEE experiments) and to mechanistic simulations (CATHARE2 and SIMMER III).Parametric studies are then carried out on two variables: the fuel burn-up and the model of neutronic feedbacks. They underline the important influence of these parameters on the transient and the final core state. Finally, a preliminary sensitivity analysis (2000 simulations) is performed on 26 uncertain parameters (linked to initial core configuration, accident features, model uncertainties and radial nodalization). The variability of the final core state is underlined and quantified; only around 25% of cases lead to core degradation. The main influent parameters on transient phenomena are also identified, enabling to prioritize core design and safety studies.In the future, this tool will be used for safety-informed design and stability analyses of fast reactor systems, allowing to emphasize the main dominant phenomena and trends of significance for safety assessment
Lemesle, Martin Martine. "Epidémiologie des accidents vasculaires cérébraux et des accidents ischémiques transitoires dans la ville de Dijon, France". Dijon, 2000. http://www.theses.fr/2000DIJOMU10.
Texto completoCherif, Mona. "Prévalence de la valve d'Eustachi et implication dans les accidents cérébrovasculaires ischémiques". Paris 13, 2004. http://www.theses.fr/2004PA130010.
Texto completoGaffet, Berteaux Béatrice. "Intérêt de l'exploration électrophysiologique endocavitaire dans les accidents ischémiques transitoires d'étiologie indéterminée". Lille 2, 1994. http://www.theses.fr/1994LIL2M243.
Texto completoBoulanger, Marion. "Amélioration de la prévention secondaire après un infarctus cérébral ou un accident ischémique transitoire (AIT)". Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC416.
Texto completoThe current long-term prognosis after transient ischaemic attack (TIA) or ischaemic stroke is not well known. I aimed to determine the long-term absolute residual risks of recurrent stroke and coronary events after TIA or ischaemic stroke and identify individuals who remain at high absolute risk of recurrent ischaemic events despite current secondary prevention management.In a population-based cohort of consecutive TIA or ischaemic stroke patients (OXVASC study, 2002-2014), the overall absolute risks of recurrent ischaemic stroke and coronary events after TIA/ischaemic stroke have decreased over the study period, and are likely to be explained by the improvement of secondary prevention over time. However, despite current secondary prevention, the subgroups of patients with prior coronary artery disease and those without prior coronary artery disease but with an Essen score of 4 remain at sufficiently high absolute risk of recurrent ischaemic events to justify more intensive treatment. Nevertheless, future secondary prevention therapies would need to achieve a substantial absolute risk reduction to outweigh increased side effects or cost compared to current therapies. Indeed, in these high-risk subgroups, more intensive lipid-lowering therapies might be justified, but we showed that the total cost of PCSK-9 inhibitors seems to exceed the generally accepted cost-effectiveness threshold while benefit from increased antithrombotic treatment might be offset by the higher risk of extracranial bleeding
Scheiff, Valentin. "Etude expérimentale et modélisation du transfert de chaleur de l'ébullition transitoire". Thesis, Toulouse, INPT, 2018. http://www.theses.fr/2018INPT0145/document.
Texto completoThe study of rapid transient boiling is an important issue in the nuclear safety. Such a phenomenon may occur in the case of a RIA (Reactivity Initiated Accident) in the core of a nuclear reactor powerplant, where a power excursion can trigger the formation of a vapour film around the fuel rod, leading to an important rise of the rod temperature and a risk of failure. Some studies in reactor conditions provided transient boiling curves but the modeling lacks of reliability. In collaboration with the IRSN (Institut de Radioprotection et de Sûreté Nucléaire), an experiment model was built at the Institute of Fluid Mechanics of Toulouse. It generates the flow of a refrigerant, HFE7000, in a semi-annular section channel, whose inner wall is made of a metal foil rapidly heated by Joule effect, simulating the heating of a fuel rod. Infrared thermography is used to measure the temperature of the metal foil, painted with a black paint to increase its emissivity, causing also an increase of the wall thermal resistance. The measurement accuracy of the interest temperature has been optimized according to the paint thickness and a correction on the energy balance takes account this parameter. These measurements are coupled with a high-speed camera that allows visualizing the boiling regimes and get bubble sizes using image processing algorithms. On a flux-temperature diagram, the heat transfers are represented both for steady and transient regimes. Each boiling regime is then reviewed : convection, onset of nucleate boiling, nucleate boiling, boiling crisis, film boiling and rewetting. Steady regimes are correctly modeled by usual correlations. Transient convection is characterized over the whole wall and its evolution is closed to the quasi-steady solution. It is shown that heat transfer during the transition to nucleate boiling are strongly related to the formation of a large vapor phase that spreads on the wall. A local study of this propagation is then necessary. In order to simulate and control transient temperature during nucleate boiling, a P.I.D. is implemented to impose a steady or ramps temperature (from 5 to 500 K.s 1 ). The results in nucleate boiling make it possible to recover the results of the literature in both steady and transient conditions. The experiment allows to study the heat transfer when a vapor film is formed and insulates the wall. The film boiling regime during heating or the cooling of the wall can thus be stabilized for several seconds with this system. The conditions for triggering of film boiling are thus characterized, as its spread dynamic and its transfers once established. Finally, the implementation of the physical characteristics of our experience in IRSN’s SCANAIR code allows us to begin to calculate and compare our experimental results with numerical simulations. Unsteady conduction calculations are applied to the measured temperature to analyze our results during the convection regime and after the onset of boiling
Lelong, Dominique. "Etablissement d'un nouveau modèle murin d'accident vasculaire cérébral : l'amaurose transitoire chez la souris". Paris 7, 2012. http://www.theses.fr/2012PA077144.
Texto completoThis study aims to characterize a new murin model of retinal ischemia, reproducing amaurosis fugax physiopathology. Amaurosis is a therapeutic emergency but its acute treatment remains controversial. Its poor prognosis when it is not quickly reversible, the difficulty to conduct decisive randomized prospective clinical trials, and the limitations of the existing animal models, makes the establishment of a new retinal ischemia preclinical model a priority for the field. We established, for the mouse, by observation of flat-mounted retinas after fluorescein systemic injection that the ligature of the pterygopalatin artery, coupled with the section of the homolateral external carotid artery interrupts the ipsilateral retinal blood circulation. Ligature's withdrawal comes along with retina reperfusion. Four weeks after a 30 min ischemic episode, significant functional changes quantitatively measurable by electroretinography contrast with a preserved histology. A preliminary qRT-PCR study of some ischemic key genes expression had for purpose to supply temporal biomarkers useful for the later design of therapeutic protocols. This purely vascular amaurosis fugax model is simple, reversible, reproducible, usable to the rat as to the mouse. It comes to complete the already available murin stroke models and can be also adapted to modelize diverse clinical situations of retinal ischemia
CARO, JOSEPH. "Interet des plaquettes marquees a l'indium 111 dans le bilan des accidents vasculaires cerebraux transitoires". Aix-Marseille 2, 1989. http://www.theses.fr/1989AIX20069.
Texto completoLibros sobre el tema "Transitoire accidentel"
Scotland. Inquiries into Fatal Accidents and Sudden Deaths etc. (Scotland) Act 2016 (Commencement No. 2, Transitional and Transitory Provision) Regulations 2016. Stationery Office, The, 2016.
Buscar texto completoCapítulos de libros sobre el tema "Transitoire accidentel"
Saliou, Guillaume, Marie Théaudin, Claire Join-Lambert Vincent y Raphaëlle Souillard-Scemama. "Accidents ischémiques transitoires". En Guide pratique des urgences neurovasculaires, 89–92. Paris: Springer Paris, 2011. http://dx.doi.org/10.1007/978-2-8178-0178-0_6.
Texto completoUchino, Ken, Jennifer Pary y James Grotta. "Accident ischémique transitoire". En Urgences neurovasculaires, 103–8. Elsevier, 2009. http://dx.doi.org/10.1016/b978-2-8101-0122-1.00007-8.
Texto completoHallouët, Pascal. "Accident ischémique transitoire (AIT) – Accident vasculaire cérébral (AVC)". En Mémo-guide infirmier, 324–29. Elsevier, 2010. http://dx.doi.org/10.1016/b978-2-294-71154-1.50055-x.
Texto completoHallouët, Pascal. "Accident ischémique transitoire (AIT), accident vasculaire cérébral (AVC)". En Méga Mémo IFSI, 1037–44. Elsevier, 2016. http://dx.doi.org/10.1016/b978-2-294-74924-7.50140-8.
Texto completoSauvage, Jean-Pierre. "Accidents ischémiques transitoires dans le territoire vertébrobasilaire". En Vertiges, 207–10. Elsevier, 2020. http://dx.doi.org/10.1016/b978-2-294-76796-8.00020-9.
Texto completoHuang, David Y. y Albert R. Hinn. "Accident vasculaire cérébral et attaques ischémiques transitoires". En Médecine interne de Netter, 963–70. Elsevier, 2011. http://dx.doi.org/10.1016/b978-2-294-70951-7.00125-0.
Texto completoKitchin, Rob. "The End of the Data Lifecycle". En Data Lives, 101–8. Policy Press, 2021. http://dx.doi.org/10.1332/policypress/9781529215144.003.0013.
Texto completoRothbaum, Barbara Olasov y Edna B. Foa. "Posttraumatic Stress Disorder Following Assault". En Reclaiming Your Life After Rape, 15–20. Oxford University PressNew York, NY, 2004. http://dx.doi.org/10.1093/oso/9780195183764.003.0003.
Texto completoSaquicela Espinoza, Luis Alberto, Carla Samantha Muzha Arevalo, Bryan Eduardo Naula Macancela y Sofia Belén Vázquez Lituma. "SHOCK HIPOVOLÉMICO". En SUTURANDO CONOCIMIENTOS EN EL ARTE DE LA CIRUGÍA. PUERTO MADERO EDITORIAL, 2022. http://dx.doi.org/10.55204/pmea.13.c62.
Texto completoActas de conferencias sobre el tema "Transitoire accidentel"
Pires, Carlos Rafael, Alberto Vicente, Marta Holguín, Laura Mateos, Alba Alegre y Maria Luisa Moro. "Accidente isquémico transitorio o no tan transitorio". En XXIX Congreso Nacional de Medicina General y de Familia y V Jornadas SEMG Andalucía. Grupo Pacífico, 2023. http://dx.doi.org/10.48158/semg23-563.
Texto completoGraff, Stéphanie. "Les situations marquées par un excès de puissance – Transitoire d’accidents de réactivité (éjection de grappe) : Critères et études de sûreté". En Comportement du combustible en situation accidentelle. Les Ulis, France: EDP Sciences, 2018. http://dx.doi.org/10.1051/jtsfen/2018com08.
Texto completoBillat, Hervé, Philippe Paulin y Hervé Mayot. "Les situations marquées par un excès de puissance – Transitoire d’accidents de réactivité (éjection de grappe) : Impact sur l'exploitation des tranches nucléaires". En Comportement du combustible en situation accidentelle. Les Ulis, France: EDP Sciences, 2018. http://dx.doi.org/10.1051/jtsfen/2018com09.
Texto completoPaulin, Philippe, F. Jolly y Christian Royère. "Les situations marquées par un excès de puissance – Transitoires de puissance de catégorie 2 : Systèmes de protection, manœuvrabilité". En Comportement du combustible en situation accidentelle. Les Ulis, France: EDP Sciences, 2018. http://dx.doi.org/10.1051/jtsfen/2018com06.
Texto completoRautenberg, Martin y Lauréline Barbié. "Les situations marquées par un excès de puissance – Transitoires de puissance de catégorie 2 : Critères et études de sûreté". En Comportement du combustible en situation accidentelle. Les Ulis, France: EDP Sciences, 2018. http://dx.doi.org/10.1051/jtsfen/2018com05.
Texto completoGeorgenthum, Vincent, Alain Moal, Christian Bernaudat y Aurore Parrot. "Les situations marquées par un excès de puissance – Transitoire d’accidents de réactivité (éjection de grappe) : Expérimentation, phénomènes physiques mis en jeu et modélisation". En Comportement du combustible en situation accidentelle. Les Ulis, France: EDP Sciences, 2018. http://dx.doi.org/10.1051/jtsfen/2018com07.
Texto completoFédérici, Eric, Christophe Garnier y Nathanaël Mozzani. "Les situations marquées par un excès de puissance – Transitoires de puissance de catégorie 2 : Expérimentations, phénomènes physiques mis en jeu et modélisation". En Comportement du combustible en situation accidentelle. Les Ulis, France: EDP Sciences, 2018. http://dx.doi.org/10.1051/jtsfen/2018com04.
Texto completoKoustanai, Arnaud, Sabine Langlois y Jean-baptiste Haue. "Technology for improved drivers’ safety: Testing a multimodal HMI". En 15th International Conference on Applied Human Factors and Ergonomics (AHFE 2024). AHFE International, 2024. http://dx.doi.org/10.54941/ahfe1005360.
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